Lot 7 Bioretention Planter

Bioretention Planters

In bioretention planters, stormwater is treated as it passes through a layer of compost-amended soil (see diagram below). In small storms, the filtered water collects in the gravel layer at the bottom and infiltrates into the soil. In larger storms, the gravel layer fills up and filtered water is carried away by a buried perforated pipe (underdrain) to the concrete drain inlet (the box with a metal grate). In a very large storm, the planter fills up and overflows into the top of the concrete drain inlet.These planters were constructed around the existing drainage systems. Only storm drain inlets located within parking stalls could be used. Use of storm drains within drive aisles would have required re-striping the whole lot. The planters were sized to minimize the loss of parking stalls but still treat a large amount of runoff.Want more details? https://www.owp.csus.edu/csus-lid/